Josh Fields hit a two-run homer in the eighth inning to seal a 4-3 win for the Charlotte Knights against the Durham Bulls Friday.The Bulls led 3-2 with one out when Fields hit on a fly ball to left field, scoring Josh Kroeger.Charlotte batters hit five doubles.Peavy start delayedRight-hander Jake Peavy's third rehab start for Charlotte has been pushed back a day, to Monday.